Band-stop Filter with Spoof Surface Plasmon Waveguide as Main Transmission Line

Abstract

In this paper, spoof surface plasmon waveguide (SSPW) which consists of metal gratings is used as a main transmission line for realizing a band-stop filter with a center frequency of 1GHz and a relative bandwidth of 40%. Two curved open truncated lines are used as resonators and mounted on the main transmission line. The Measured Sparameters of the band-stop filter agree well with the simulated ones, validating the feasibility of the design ideas. Compared to traditional microstrip filters, The length of the main part is shortened due to the slow-wave effect of the SPPs.